- in the 1920s
- in the 1930s
- in the 1940s
- in the 1950s
- to teach at academic school
- to sell to other countries
- to spread knowledge
- to include the military industrial complex
- INTRANET
- CONPANET
- INTERNET
- ARPPANET
- by the late 1980s
- by the late 1970s
- by the late 1990s
- by the late 1960s